Variation Of Geomagnetic Storm As Observed During Solar Cycle 24.

The sun activity governs the interaction of magnetosphere with solar wind and Earthrnmagnetic eld, this inrnuence of magnetosphere is called Geomagnetic storm. Thernmain point to study Geomagnetic storm is used to understand the current passingrnthrough the ionosphere. The Geomagnetic Storms occurred during the whole solarrncycle 24 were analyzed using southward Interplanetary magnetic eld (IMF(Bz)),rnInterplanetary electric eld of the ring current (IEF), the solar wind velocity (SW)rnand the Dst index from OMNI data explorer. As the results reveal at the highrnsolar activity CME driven geomagnetic storms are more prominent than CIR drivenrnGeomagnetic Storms. On the Other hand, these solar activity starts declining solarrnmaximum events derived from CIR-driven storms. Moreover that it is clear from thernobservations of geomagnetic storm events that the occurrence of Geomagnetic Stormsrnis highly correlated with the southward turning of Bz, the z component of IMF.rnThe magnitude of turning of Bz into southward direction from northward directionrndepends highly upon the severity of the storm

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